亜鉛浸出液の浄液に関する研究 亜ヒ酸，銅イオン，亜鉛末によるコバルト浄液法の反応機構

Abstract

Cobalt precipitation by zinc dust with co-addition of arsenious oxide and copper ion in a practical operation was simulated by the experiments using a galvanic cell with a diaphragm and this mechanism for removal of cobalt was explained as follows; a galvanic cell was formed between zinc dust and copper particles, which were precipitated first by zinc dust, and cobalt is deposited on copper particles by this galvanic cell and arsenious oxide in a solution accelerated the rate of precipitation of cobalt by co-deposition of As-Co. The anode side reaction of this galvanic cell is Zn=Zn2++2e-and a main cathode reaction is 2H++2e-=H2 (g). Cobalt is difficult to be precipitated on copper without arsenious oxide. The galvanic current between zinc and copper becomes higher by addition of arsenious oxide. The over potential of the cathode reaction sifts the cathode potential to belower potential than the deposition potential of Co-As, and this Co-Aseasily deposits on copper cathode with hydrogen.